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Finding the Fourth Proportional to 319.51, 478.25 and 261.59

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Solution

The fourth proportional to 319.51, 478.25 and 261.59 is: 391.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.51 : 478.25 = 261.59 : x
  2. Step 2: Convert to fraction form
    319.51/478.25 = 261.59/x
  3. Step 3: Cross multiply
    319.51x = 478.25 × 261.59
  4. Step 4: Simplify right side
    319.51x = 125,104.11
  5. Step 5: Solve for x
    x = 125,104.11/319.51
  6. Step 6: Final answer
    x = 391.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.